You can fold paper money and place it in your pocket without a problem. The same can't be said for polymer money, which is designed specifically to resist attempts at folding. The use of polymer is intended to increase the life of a bill, but without being able to fold it at all, those who use folding wallets or prefer to carry bills in their pocket will have a difficult time making do. When a polymer banknote is folded, the action creates a crease in the middle of the bill. While paper notes fold back without much problem, the crease in the polymer bill remains there permanently.